Beyoncé Knowles will use her sultry voice and singing chops to be the lead singer of yet another girl group. Only this time, she’ll be behind the scenes as the voice of Shine, the lead vocalist of the cartoon singing group “Wubb Girlz.” Knowles will make her voiceover debut as a guest star on Nickelodeon’s comedy children’s series “Wow! Wow! Wubbzy!” on April 27 at 10:00 a.m. (ET/PT). The superstar wrote an original song, “Sing a Song,” for the week-long musical bash featuring “Wubb Girlz.”

“I’m so happy to be a part of Wow! Wow! Wubbzy! because I’m finally able to impress my nephew,” Knowles confessed in an official statement. “Shine is a member of the group The Wubb Girlz, which I can identify with having grown up in Destiny’s Child. The Wubb Girlz are all about unity — they sing cool harmonies and have an amazing new original song, ‘Sing a Song.’”

The Wubb Girlz tune, sung by Beyoncé, will be available on iTunes on April 21. Catch Knowles as “Shine” on Nickelodeon’s “Wow! Wow! Wubbzy!” April 27 through April 30. -PS

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